<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <p class='demo'>hello JavaScript</p>
    <script>
   
// 8. 获取<p class='demo'>hello JavaScript</p>内部文案
        var demo = document.getElementsByClassName("demo")
        const [a,...rest] =demo
        const { innerHTML } = a
        console.log(innerHTML)
    </script>
</body>
</html>